NILFS-TUNE(8)NILFS-TUNE(8)NAME
nilfs-tune - adjust tunable file system parameters on NILFS file system
SYNOPSIS
nilfs-tune [options] device
DESCRIPTION
nilfs-tune is a utility to modify tunable file system parameters on
NILFS2 file system in device.
This command is valid for inactive NILFS2 file systems. Modifying
active mounts may cause severe damage.
OPTIONS-f Force to modify even the specified file system is mounted.
-i interval
Set the commit interval of segment.
-m block-max
Set the threshold of the data amount of the segment construc‐
tion.
-l List the contents of the file system superblock, including the
current values of the parameters that can be set via this pro‐
gram.
-L volume-label
Set the volume label of the file system. NILFS2 file system
labels can be at most 80 bytes long. If volume-label is longer
than 80 bytes, nilfs-tune will truncate it. The volume label
can be used mount(8) and /etc/fstab(5) (and possibly others) by
specifying LABEL=volume-label instead of a block special device
name like /dev/sda5.
-O [^]feature[,...]
Set or clear the indicated filesystem features (options) in the
filesystem. More than one filesystem feature can be cleared or
set by separating features with commas. Filesystem features
prefixed with a caret character ('^') will be cleared in the
filesystem's superblock; filesystem features without a prefix
character will be added to the filesystem.
The following filesystem feature can be set or cleared using
nilfs-tune:
block_count
Enable block count per checkpoint. After setting this
option, fsck should be run on the filesystem to make the
counts right, but no fsck tool is available yet, sorry.
-U UUID
Set the universally unique identifier (UUID) of the file system
to UUID. The format of the UUID is a series of hex digits sepa‐
rated by hyphens, like this:
"c1b9d5a2-f162-11cf-9ece-0020afc76f16".
-h Display help message and exit.
AUTHOR
Jiro SEKIBA <jir@unicus.jp>
AVAILABILITY
nilfs-tune is part of the nilfs-utils package and is available from
http://www.nilfs.org.
SEE ALSOnilfs(8), lscp(1), chcp(8), mkcp(8), rmcp(8).
nilfs-utils version 2.1 May 2011 NILFS-TUNE(8)